CN110557841A - prioritizing conflicting transmissions in LTE and ultra-low latency LTE communications - Google Patents

Abstract

Various aspects described herein relate to allocating a first set of resources for transmitting a first communication according to a first Transmission Time Interval (TTI); allocating a second set of resources for transmitting a second communication according to a second TTI, wherein the second TTI is less than the first TTI; transmitting a first resource grant corresponding to the first set of resources on a downlink control channel; and transmitting a second resource grant corresponding to the second set of resources on the downlink control channel.

Description

Prioritizing conflicting transmissions in LTE and ultra-low latency LTE communications

The application is a divisional application of a patent application with an application date of 2015, 11 and 03, entitled "prioritizing conflicting transmissions in LTE and ultra low latency LTE communications", and an application number of 201580067251.4.

cross Reference to Related Applications

The present application claims the benefit of U.S. provisional application No.62/090,826 entitled "prior lubricating binding transporting semiconductors IN LTE AND ULTRA-LOW LATENCY LTE communica contacts" filed on 11.2014 AND U.S. patent application No.14/930,017 entitled "prior lubricating binding transporting semiconductors IN LTE AND ULTRA-LOW LATENCY LTE communica" filed on 11.2015.2, which are expressly incorporated herein by reference.

background

Described herein are aspects that relate generally to communication systems and, more particularly, to prioritizing communications of wireless technologies.

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth, transmit power). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

these multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the urban, national, regional, or even global level. An example of a telecommunications standard is Long Term Evolution (LTE). LTE is an enhanced set of Universal Mobile Telecommunications System (UMTS) mobile standards promulgated by the third generation partnership project (3 GPP). It is designed to better support mobile broadband internet access by improving spectral efficiency, reduce costs, improve services, use new spectrum, and better integrate with other open standards using OFDMA on the Downlink (DL), SC-FDMA on the Uplink (UL), and multiple-input multiple-output (MIMO) antenna technology. However, as the demand for mobile broadband access continues to increase, further improvements in LTE technology may be desirable. Preferably, these improvements should be applicable to other multiple access techniques and telecommunications standards employing these techniques.

In a wireless communication system employing conventional LTE, the multiple UEs served by a particular eNodeB may be scheduled resources for communicating with the eNodeB over one or more channels using Transmission Time Intervals (TTIs) on the order of 1 millisecond subframes. As UE capabilities and bandwidth requirements increase, lower communication delays may be desired.

disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

According to an example, a method of wireless communication is provided. The method includes receiving a first communication over a first set of resources based on a first Transmission Time Interval (TTI), and receiving a second communication over a second set of resources based on a second TTI. The second TTI is less than the first TTI, and the second set of resources overlaps with the first set of resources to define a common set of resources. The method also includes determining whether to prioritize decoding of the first communication over the second communication.

In other aspects, a user equipment for wireless communication is provided. The user equipment includes: the apparatus may include a transceiver, at least one processor communicatively coupled with the transceiver via a bus to transmit signals in a wireless network, and a memory communicatively coupled with the at least one processor and/or the transceiver via the bus. The at least one processor and the memory are operable to receive, via the transceiver, a first communication over a first set of resources based on a first TTI, and receive, via the transceiver, a second communication over a second set of resources based on a second TTI. The second TTI is less than the first TTI, and the second set of resources overlaps with the first set of resources to define a common set of resources. The at least one processor and the memory are further operable to determine whether to prioritize decoding of the first communication over the second communication.

In another example, a method of wireless communication is provided. The method comprises the following steps: a first set of resources is allocated for transmitting a first communication according to a first TTI, and a second set of resources is allocated for transmitting a second communication according to a second TTI. The second TTI is less than the first TTI. The method also includes sending a first resource grant corresponding to the first set of resources on a downlink control channel, and sending a second resource grant corresponding to the second set of resources on the downlink control channel.

In other aspects, an evolved node b (enb) for wireless communication is provided. The eNB includes: the apparatus may include a transceiver, at least one processor communicatively coupled with the transceiver via a bus to transmit signals in a wireless network, and a memory communicatively coupled with the at least one processor and/or the transceiver via the bus. The at least one processor and the memory can be operable to allocate a first set of resources for transmitting a first communication according to a first TTI and allocate a second set of resources for transmitting a second communication according to a second TTI. The second TTI is less than the first TTI. The at least one processor and the memory are further operable to send, via the transceiver, a first resource grant corresponding to the first set of resources on a downlink control channel, and send, via the transceiver, a second resource grant corresponding to the second set of resources on the downlink control channel.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the description is intended to include all such aspects and their equivalents.

Drawings

In order to facilitate a fuller understanding of the aspects described herein, reference is now made to the accompanying drawings in which like elements are numbered alike. These drawings should not be construed as limiting the present disclosure, but are intended to be merely illustrative.

Fig. 1 illustrates a block diagram conceptually illustrating an example of a telecommunications system in accordance with aspects described herein.

Fig. 2 is a diagram illustrating an example of an access network.

Fig. 3 is a diagram illustrating an example of an evolved node B and user equipment in an access network.

Fig. 4 is a diagram illustrating an example time axis for uplink bandwidth allocation.

Fig. 5 is a diagram illustrating an example subframe with conflicting legacy resources and Ultra Low Latency (ULL) resources.

Fig. 6 is a diagram illustrating an example system that determines whether to prioritize legacy communications or ULL communications in accordance with aspects described herein.

Fig. 7 is a flow diagram of an example method for determining whether to prioritize legacy communications or ULL communications in accordance with aspects described herein.

Fig. 8 is a flow diagram of an example methodology for allocating legacy communication resources and ULL communication resources in accordance with an aspect described herein.

Detailed Description

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. It will be apparent, however, to one skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Several aspects of a telecommunications system will now be presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

By way of example, an element or any portion of an element or any combination of elements may be implemented with a "processing system" that includes one or more processors. Examples of processors include microprocessors, microcontrollers, Digital Signal Processors (DSPs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in the processing system may execute software. Software should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subprograms, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, programs, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

Thus, in one or more aspects, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), and floppy disk wherein disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

described herein are various aspects related to prioritizing conflicting communications corresponding to legacy communication technologies and ultra low delay (ULL) communication technologies, wherein the communication technologies can be based on Transmission Time Intervals (TTIs) of different lengths (e.g., the ULL communication technologies have shorter TTI durations than the legacy communication technologies). For example, legacy LTE technology may use TTIs having a duration that is defined in LTE as a subframe, where Ultra Low Latency (ULL) LTE technology may be based on TTIs having a duration that is less than a subframe (e.g., one symbol, two symbols, a subframe slot, etc.). In this regard, lower communication delays are achieved with shorter, more frequent TTIs. In some cases, the legacy technology may be a legacy cellular technology that is different from the legacy LTE technology. A network may support both legacy communication technologies and ULL communication technologies on similar frequency bands and may therefore potentially schedule conflicting downlink resources on which one or more User Equipments (UEs) receive signals from the network. For example, the collision of downlink resources may be caused in part by a shortened TTI associated with the ULL because resources may be allocated more frequently than with conventional communication technologies, and resources scheduled for transmission with conventional communication technologies may also be scheduled, at least in part, for transmission with ULL communication technologies to meet scheduling requirements in the ULL communication technologies. It is to be appreciated that LTE and ULL LTE are used as examples of conventional and ULL communication technologies, respectively, herein, but that the foregoing concepts can be applied to substantially any combination of communication technologies in which one communication technology has a shorter TTI than the other.

In one example, a UE may prioritize receipt of conflicting communications over a communication technology (e.g., legacy LTE resources and ULL LTE resources) based on one or more rules configured in the UE, which may be based at least in part on a type of the communications over the resources. For example, where the legacy technology communications include broadcast data, demodulation reference signals (DM-RS), and/or the like, the UE may cause the legacy technology communications to be received preferentially over the ULL technology communications in overlapping related resources. In another example, a network supporting legacy technologies and ULL technologies and transmitting associated communications may configure the resources for the UE and may avoid overlapping legacy technology resources and ULL technology resources and/or may otherwise instruct the UE to prioritize legacy technology communications or ULL technology communications on certain overlapping resources.

Referring initially to fig. 1, a diagram illustrates an example of a wireless communication system 100 in accordance with aspects described herein. The wireless communication system 100 includes a plurality of access points (e.g., base stations, enbs, or WLAN access points) 105, a plurality of User Equipments (UEs) 115, and a core network 130. Access point 105 may include a scheduling component 302 configured to schedule and communicate with UE115 using legacy communication technologies and ULL communication technologies (e.g., legacy LTE and ULL LTE) that are based on a smaller TTI. Similarly, one or more of UEs 115 may include a communicating component 361 configured to prioritize communications of a conventional communication technology (e.g., LTE) and a ULL communication technology (e.g., ULL LTE). Some of the access points 105 may communicate with the UEs 115 under control of a base station controller (not shown), which may be part of the core network 130 or some access points 105 (e.g., base stations or enbs) in various examples. Access point 105 may communicate control information and/or user data with core network 130 via backhaul link 132. In an example, the access points 105 can communicate with each other directly or indirectly through backhaul links 134, which backhaul links 134 can be wired communication links or wireless communication links. The wireless communication system 100 may support operation on multiple carriers (waveform signals of different frequencies). Multicarrier transmitters may transmit modulated signals on the multiple carriers simultaneously. For example, each communication link 125 may be a multi-carrier signal modulated according to the various radio technologies described above. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.

In some examples, at least a portion of the wireless communication system 100 may be configured to operate on multiple hierarchical layers, wherein one or more of the UEs 115 and one or more of the access points 105 may be configured to support transmissions on hierarchical layers having reduced delay relative to another hierarchical layer. In some examples, the hybrid UE 115-a may communicate with the access point 105-a on both a first hierarchical layer that supports first layer transmissions using a first TTI (which may involve "legacy communication techniques") and a second hierarchical layer that supports second layer transmissions using a second TTI (which may involve "ULL communication techniques"), which may be shorter than the first TTI.

In other examples, the second tier UE 115-b may communicate with the access point 105-b only on the second hierarchical layer. Thus, a hybrid UE 115-a and a second layer UE 115-b may belong to a second type of UE115 that may communicate on the second hierarchical layer, while a legacy UE115 may belong to a first type of UE115 that may communicate only on the first hierarchical layer. The access point 105-b and the UE 115-b may communicate at the second hierarchical layer through transmission of subframes of a second subframe type. Access point 105-b may send communications related to only the first hierarchical layer or the second hierarchical layer, or may send communications for both the first hierarchical layer and the second hierarchical layer. In instances in which access point 105-b supports both the first hierarchical layer and the second hierarchical layer, communicating component 361 may be configured to prioritize communications received from access point 105-b related to the first hierarchical layer and the second hierarchical layer, as described herein.

The access point 105 may wirelessly communicate with the UE115 via one or more access point antennas. Each of the access point 105 stations may provide communication coverage for a respective coverage area 110. In some examples, the access point 105 may be referred to as a base transceiver station, a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a NodeB, an eNodeB, a home NodeB, a home eNodeB, or some other suitable terminology. The coverage area 110 of a base station may be divided into sectors (not shown) that form only a portion of the coverage area. The wireless communication system 100 may include different types of access points 105 (e.g., macro, micro, and/or pico base stations). The access point 105 may also use different radio technologies such as cellular and/or WLAN Radio Access Technologies (RATs). The access points 105 may be associated with the same or different access networks or operator deployments. The coverage areas of different access points 105 may overlap, including coverage areas of the same or different types of access points 105 using the same or different wireless technologies and/or belonging to the same or different access networks.

In a network communication system using LTE/LTE-a and/or ULL LTE communication technologies, the term evolved node B (eNodeB or eNB) may be used generally to describe the access point 105. The wireless communication system 100 may be a heterogeneous LTE/LTE-a/ULLLTE network where different types of access points provide coverage for various geographic areas. For example, each access point 105 may provide communication coverage for a macrocell, picocell, femtocell, and/or other type of cell. Small cells, such as pico cells, femto cells, and/or other types of cells, may include low power nodes or LPNs. A macro cell typically covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 115 with service subscriptions of the network provider. The small cell will typically cover a relatively small geographic area and may allow unrestricted access by, for example, UEs 115 with service subscriptions of the network provider, and may provide restricted access by UEs 115 with which the small cell has an association (e.g., UEs in a Closed Subscriber Group (CSG), UEs of users in the home, etc.) in addition to unrestricted access. The eNB for the macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells.

The core network 130 may communicate with enbs or other access points 105 via one or more backhaul links 132 (e.g., S1 interface, etc.). The access points 105 may also communicate with each other, directly or indirectly, e.g., via a backhaul link 134 (e.g., an X2 interface, etc.) and/or via a backhaul link 132 (e.g., through the core network 130). The wireless communication system 100 may support synchronous operation or asynchronous operation. For synchronous operation, access points 105 may have similar frame timing, and transmissions from different access points 105 may be approximately aligned in time. For asynchronous operation, access points 105 may have different frame timing, and transmissions from different access points 105 may not be aligned in time. Further, transmissions in the first hierarchical layer and the second hierarchical layer may be synchronized between access points 105 or may not be synchronized between access points 105. The techniques described herein may be used for synchronous operations or asynchronous operations.

UEs 115 are dispersed throughout the wireless communication system 100, and each UE115 may be stationary or mobile. UE115 may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The UE115 may be a cellular phone, a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wearable item such as a watch or glasses, a Wireless Local Loop (WLL) station, or the like. The UE115 can communicate with a macro eNodeB, a small cell eNodeB, a relay, and the like. The UE115 may also be capable of communicating over different access networks, such as a cellular network or other WWAN access network or WLAN access network.

The communication links 125 shown in the wireless communication system 100 may include Uplink (UL) transmissions from the UEs 115 to the access point 105 and/or Downlink (DL) transmissions from the access point 105 to the UEs 115. The downlink transmission may also be referred to as a forward link transmission, and the uplink transmission may also be referred to as a reverse link transmission. The communication link 125 may carry the transmissions of each hierarchical layer, which may be multiplexed in the communication link 125 in some examples. The UE115 may be configured to cooperatively communicate with multiple access points 105 through, for example, multiple-input multiple-output (MIMO), Carrier Aggregation (CA), coordinated multipoint (CoMP), or other schemes. MIMO technology uses multiple antennas on the access point 105 and/or multiple antennas on the UE115 to transmit multiple data streams. Carrier aggregation may use two or more component carriers for data transmission on the same or different serving cells. CoMP may include techniques for coordinating transmission and reception by multiple access points 105 to improve overall transmission quality for the UE115 and to increase network and spectrum utilization.

As mentioned, in some examples, the access point 105 and the UE115 may transmit on multiple carriers using carrier aggregation. In some examples, the access point 105 and the UE115 may simultaneously transmit one or more subframes within a frame in the first hierarchical layer using two or more separate carriers, each of the one or more subframes having a first subframe type. Each carrier may have a bandwidth of, for example, 20MHz, although other bandwidths may be used. In some examples, the hybrid UE 115-a and/or the second layer UE 115-b may receive and/or transmit one or more subframes in the second hierarchical layer using a single carrier having a bandwidth greater than a bandwidth of one or more of the separate carriers. For example, if four separate 20MHz carriers are used in the carrier aggregation scheme in the first hierarchical layer, a single 80MHz carrier may be used in the second hierarchical layer. The 80MHz carrier may occupy a portion of the radio frequency spectrum that at least partially overlaps with a radio frequency spectrum used by one or more of the four 20MHz carriers. In some examples, the scalable bandwidth for the second hierarchical layer type may be a combining technique to provide a shorter RTT, such as described above, to provide further enhanced data rates.

Each of the different modes of operation that may be employed by wireless communication system 100 may operate in accordance with Frequency Division Duplexing (FDD) or Time Division Duplexing (TDD). In some examples, different hierarchical layers may operate according to different TDD modes or FDD modes. For example, a first hierarchical layer may operate according to FDD, while a second hierarchical layer may operate according to TDD. In some examples, OFDMA communication signals may be used in communication link 125 for LTE downlink transmissions in each hierarchical layer, while single carrier frequency division multiple access (SC-FDMA) communication signals may be used in communication link 125 for LTE uplink transmissions in each hierarchical layer. Additional details regarding the implementation of hierarchical layers in systems such as wireless communication system 100, as well as other features and functions related to communication in such systems, are provided below with reference to the following figures.

Fig. 2 is a diagram illustrating an example of an access network 200 in an LTE or ULL LTE network architecture. In this example, the access network 200 is divided into a plurality of cellular regions (cells) 202. One or more lower power level enbs 208 may have cellular regions 210 that overlap with one or more of cells 202. The lower power class eNB 208 may be a femto cell (e.g., a home eNB (henb)), pico cell, micro cell, or Remote Radio Head (RRH). Each of the macro enbs 204 is assigned to a respective cell 202 and is configured to provide an access point to the core network 130 for all UEs 206 in the cell 202. In an aspect, eNB 204 may include a scheduling component 302 configured to schedule and communicate with UE 206 using legacy communication technologies and ULL communication technologies (e.g., legacy LTE and ULL LTE) that are based on a smaller TTI. Similarly, one or more of UEs 206 may include a communicating component 361 configured to prioritize communications of a conventional communication technology (e.g., LTE) and a ULL communication technology (e.g., ULL LTE). There is no centralized controller in this example of the access network 200, but a centralized controller may be used in alternative configurations. The eNB 204 is responsible for all radio related functions including radio bearer control, admission control, mobility control, scheduling, security, and connectivity to one or more components of the core network 130.

the modulation and multiple access schemes employed by the access network 200 may vary depending on the particular telecommunications standard being deployed. In LTE or ULL LTE applications, OFDM may be used on the DL and SC-FDMA may be used on the UL to support both Frequency Division Duplex (FDD) and Time Division Duplex (TDD). As will be readily apparent to those skilled in the art from the following detailed description, the various concepts presented herein are well suited for LTE applications. However, these concepts can be readily extended to other telecommunication standards employing other modulation and multiple access techniques. By way of example, these concepts may be extended to evolution-data optimized (EV-DO) or Ultra Mobile Broadband (UMB). EV-DO and UMB are air interface standards promulgated by the third generation partnership project 2(3GPP2) as part of the CDMA2000 family of standards and employ CDMA to provide broadband internet access to mobile stations. These concepts may also be extended to Universal Terrestrial Radio Access (UTRA) using wideband CDMA (W-CDMA) and other variants of CDMA, such as TD-SCDMA; global system for mobile communications (GSM) using TDMA; and evolved UTRA (E-UTRA), IEEE 802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, and Flash-OFDM using OFDMA. UTRA, E-UTRA, UMTS, LTE, and GSM are described in documents from the 3GPP organization. CDMA2000 and UMB are described in documents from the 3GPP2 organization. The actual wireless communication standard and multiple access technique employed will depend on the particular application and the overall design constraints imposed on the system.

the eNB 204 may have multiple antennas supporting MIMO technology. The use of MIMO technology enables eNB 204 to utilize the spatial domain to support spatial multiplexing, beamforming, and transmit diversity. Spatial multiplexing may be used to transmit different data streams simultaneously on the same frequency. The data stream may be sent to a single UE 206 to increase the data rate or to multiple UEs 206 to increase the overall system capacity. This is achieved by spatially precoding each data stream (i.e., applying a scaling of amplitude and phase) and then transmitting each spatially precoded stream through multiple transmit antennas on the DL. The spatially precoded data streams arrive at the UE 206 with different spatial characteristics, which enables each of the UEs (206) to recover one or more data streams destined for that UE 206. On the UL, each UE 206 transmits a spatially precoded data stream, which enables the eNB 204 to identify the source of each spatially precoded data stream.

When channel conditions are good, spatial multiplexing is typically used. Beamforming may be used to concentrate the transmission energy in one or more directions when channel conditions are less favorable. This may be achieved by spatially precoding the data for transmission over multiple antennas. To achieve good coverage at the cell edge, single stream beamforming transmission can be used in combination with transmit diversity.

In the detailed description that follows, various aspects of an access network will be described with reference to a MIMO system that supports OFDM on the DL. OFDM is a spread spectrum technique that modulates data over multiple subcarriers within an OFDM symbol. The subcarriers are spaced apart at precise frequencies. The spacing provides "orthogonality" that enables a receiver to recover the data from the subcarriers. In the time domain, a guard interval (e.g., a cyclic prefix) may be added to each OFDM symbol to combat inter-OFDM symbol interference. The UL may compensate for high peak-to-average power ratio (PAPR) using SC-FDMA in the form of a DFT-spread OFDM signal.

Fig. 3 is a block diagram of an eNB 310 in communication with a UE350 in an access network. In the DL, upper layer packets from the core network are provided to a controller/processor 375. Controller/processor 375 implements the functionality of the L2 layer. In the DL, the controller/processor 375 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the UE350 based on various priority metrics. The controller/processor 375 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the UE 350.

a Transmit (TX) processor 316 performs various signal processing functions for the L1 layer (i.e., the physical layer). The signal processing functions include coding and interleaving to facilitate Forward Error Correction (FEC) at the UE350, and mapping to signal constellations based on various modulation schemes (e.g., Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols are then separated into parallel streams. Each stream is then mapped to OFDM subcarriers, multiplexed with reference signals (e.g., pilots) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time-domain OFDM symbol stream. The OFDM streams are spatially precoded to produce a plurality of spatial streams. The channel estimates from channel estimator 374 may be used to determine coding and modulation schemes and for spatial processing. The channel estimates may be derived from channel condition feedback and/or reference signals transmitted by the UE 350. Each spatial stream is then provided to a different antenna 320 via a separate transmitter 318 TX. Each transmitter 318TX modulates an RF carrier with a respective spatial stream for transmission. Further, the eNB 310 can include a scheduling component 302 configured to schedule and communicate with the UE350 using legacy communication technologies and ULL communication technologies (e.g., legacy LTE and ULL LTE) that are based on the smaller TTI.

At the UE350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to a Receive (RX) processor 356. RX processor 356 performs various signal processing functions at the L1 layer. The RX processor 356 performs spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE350, they may be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a different OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the eNB 310. These soft decisions may be based on channel estimates computed by channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the eNB 310 on the physical channel. The data and control signals are then provided to a controller/processor 359.

Controller/processor 359 implements the L2 layer. The controller/processor can be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the core network. The upper layer packet is then provided to a data sink 362 representing all protocol layers above the L2 layer. Various control signals may also be provided to the data sink 362 for L3 processing. The controller/processor 359 is also responsible for error detection using an Acknowledgement (ACK) protocol and/or a Negative Acknowledgement (NACK) protocol to support HARQ operations. Further, communicating component 361 is configured to prioritize communications of a conventional communication technology (e.g., LTE) and ULL communication technology (e.g., ULL LTE).

In the UL, a data source 367 is used to provide upper layer packets to controller/processor 359. Data source 367 represents all protocol layers above the L2 layer. Similar to the functionality described in connection with the DL transmission by the eNB 310, the controller/processor 359 implements the L2 layer for the user plane and the control plane by providing header compression, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations by the eNB 310. The controller/processor 359 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the eNB 310.

Channel estimates, derived by a channel estimator 358 from feedback or reference signals transmitted by the eNB 310, may be used by the TX processor 368 to select appropriate coding and modulation schemes, as well as to facilitate spatial processing. The spatial streams generated by the TX processor 368 are provided to different antennas 352 via separate transmitters 354 TX. Each transmitter 354TX modulates an RF carrier with a respective spatial stream for transmission.

At the eNB 310, the UL transmissions are processed in a manner similar to that described for the receiver function at the UE 350. Each receiver 318RX receives a signal through its corresponding antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to RX processor 370. RX processor 370 may implement the L1 layer.

Controller/processor 375 implements the L2 layer. The controller/processor 375 can be associated with a memory 376 that stores program codes and data. Memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the UE 350. Upper layer packets from controller/processor 375 may be provided to the core network. The controller/processor 375 is also responsible for error detection using the ACK protocol and/or the NACK protocol to support HARQ operations.

Fig. 4 is a diagram illustrating a non-limiting example of a ULL timeline 400,402 for managing ULL communications in a wireless communication system, the ULL timeline having a time progression in the diagram extending from left to right. In this example, the time axis 400,402 includes ULL frames with symbol durations in each symbol of a subframe. Both time axes 400,402 depict symbols representing TTIs for ULL physical downlink control channel (uPDCCH) and/or ULL physical downlink shared channel (uPDSCH) and symbols representing TTIs including ULL physical uplink control channel (uPUCCH) and/or ULL physical uplink shared channel (uPUSCH). In time axis 400, 14 symbols are shown in a given subframe (e.g., for normal CP) and 12 symbols are shown in a given subframe (e.g., for extended CP) in time axis 402. In either case, lower delay is achieved in the ULL by using symbol-based TTIs. It is to be appreciated that in other examples, a TTI may be two or more symbols, a slot of a subframe (where a subframe includes two slots), and so forth. In addition, the HARQ process response time may be 3 symbols (or 4 symbols, 3 dual symbols, 3 slots, etc.). In the example shown, in the subframe, uPDCCH/uPDSCH is transmitted in symbol 0, and HARQ is processed and transmitted in symbol 4, and so on.

Fig. 5 is a diagram illustrating a non-limiting example of a 1ms subframe 500 including legacy downlink transmission resources 502 for a legacy communication technique. Legacy downlink transmission resources 502 may correspond to, for example, Physical Data Shared Channel (PDSCH)/Enhanced Physical Downlink Control Channel (EPDCCH) transmissions in LTE and may include one or more non-DM-RS regions 504 and one or more DM-RS regions 506, where the DM-RS regions 506 include resource elements (e.g., contiguous groups of resource elements) configured for DM-RS transmissions. Thus, as shown, ULL transmission resources may be allocated so as not to overlap with legacy downlink transmission resources 502, as shown by exemplary ULL transmission resources 510. However, in other examples, the ULL transmission resources may be allocated to overlap with legacy downlink transmission resources 502 in non-DM-RS region 540, as shown by ULL transmission resources 512, or allocated to overlap with legacy downlink transmission resources 502 in DM-RS region 506, as shown by ULL transmission resources 514. This may occur, for example, in the following cases: while the eNB is transmitting on the legacy downlink transmission resources, the eNB allocates ULL transmission resources 514 (since the allocation may occur at a faster rate in the ULL due to the shortened TTI).

Accordingly, the UE may be configured to prioritize communications where legacy downlink transmission resources and ULL transmission resources overlap (e.g., for ULL transmission resources 512 and 514), as further described herein. In one example, legacy downlink transmission resource 502 and ULL transmission resource 510,512, or 514 may relate to a given UE. Thus, the UE may be configured to prioritize communications received on legacy downlink transmission resources 502 and overlapping ULL transmission resources 512 or 514. In another example, legacy downlink transmission resources 502 and ULL transmission resources 512,514 can relate to different UEs, and UEs related to ULL transmission resources 512,514 can then be configured to prioritize communications received on overlapping ULL transmission resources 512 and 514, where legacy downlink transmission resources 502 correspond to communications with one or more other UEs, as further described herein.

it is to be appreciated that in LTE, an eNB may transmit DM-RS in one or more Code Division Multiplexing (CDM) groups, wherein the DM-RS may be multiplexed in each CDM group based on a rank (e.g., a number of antennas used to transmit the DM-RS). For example, for a rank of 4 or less, the eNB may transmit the DM-RS based on a spreading factor of two such that the DM-RS is spread over two OFDM symbols that are consecutive in time. For ranks greater than 4, for example, the eNB may transmit the DM-RS based on a spreading factor of four, such that the DM-RS is spread over four temporally consecutive OFDM symbols.

Referring to fig. 6-8, aspects are depicted with reference to one or more components and one or more methodologies that may perform the actions or functions described herein. In an aspect, the term "component" as used herein may be one of the components that make up a system, may be hardware or software or some combination thereof, and may be divided among other components. While the operations described below in fig. 7 and 8 are presented in a particular order and/or as being performed by example components, it should be understood that the order of the acts and the components performing the acts may vary depending on the implementation. Further, it should be understood that the following acts or functions may be performed by a specially programmed processor, a processor executing specially programmed software or computer readable media, or by any other combination of hardware components and/or software components capable of performing the described acts or functions.

Fig. 6 illustrates an example system 600 for prioritizing legacy communications or ULL communications. The system 600 includes a UE602, examples of which are described above in fig. 1-3 (e.g., access point 105, eNB 204, lower power level eNB 208, eNB 310, UE115,206,350, etc.), for communicating with an eNB604 to access a wireless network. In an aspect, the eNB604 and the UE602 may establish one or more downlink channels on which to communicate via downlink signals 609, which may be transmitted by the eNB604 (e.g., via the transceiver 656) and received by the UE602 (e.g., via the transceiver 606) for communicating control and/or data messages (e.g., in signaling) from the eNB604 to the UE602 over the configured communication resources. Further, for example, the eNB604 and the UE602 may establish one or more uplink channels on which to communicate via uplink signals 608, which uplink signals 608 may be transmitted by the UE602 (e.g., via the transceiver 606) and received by the eNB604 (e.g., via the transceiver 656) for communicating control and/or data messages (e.g., in signaling) from the UE602 to the eNB604 over the configured communication resources. As further described herein, for example, eNB604 may transmit a resource grant 680, which may indicate resources over which UE602 is to transmit (e.g., transmit or receive) data with eNB604, wherein the resources may correspond to legacy communication techniques and/or ULL communication techniques, as described. For example, resources related to ULL communication technologies can relate to the ULL timeline (e.g., the timeline with TTIs of less duration than subframes, such as timelines 400,402 in fig. 4).

In an aspect, UE602 may include one or more processors 603 and/or memory 605, which may be communicatively coupled, e.g., via one or more buses 607, and may operate in conjunction with communicating component 361 or otherwise implement communicating component 361 for receiving resource grants for legacy communication techniques and/or ULL communication techniques from eNB604 and communicating on the resources based on the resource grants. For example, various operations related to the communications component 361 may be implemented or otherwise performed by one or more processors 603, and in an aspect, the various operations may be performed by a single processor, while in other aspects, different ones of the operations may be performed by a combination of two or more different processors. For example, in an aspect, the one or more processors 603 may include any one or any combination of a modem processor, or a baseband processor, or a digital signal processor, or an Application Specific Integrated Circuit (ASIC), or a transmit processor, a receive processor, or a transceiver processor associated with the transceiver 606. Further, for example, the memory 605 may be a non-transitory computer-readable medium including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), programmable ROM (prom), erasable prom (eprom), electrically erasable prom (eeprom), a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., Compact Disk (CD), Digital Versatile Disk (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), a register, a removable disk, and any other suitable medium for storing software and/or computer-readable code or instructions that may be accessed and read by a computer or one or more processors 603. Further, the memory 605 or computer-readable storage medium may reside in the one or more processors 603, external to the one or more processors 603, distributed across multiple entities including the one or more processors 603, and so forth.

In particular, the one or more processors 603 and/or memory 605 may perform the actions or operations defined by the communications component 361 or its subcomponents. For example, the one or more processors 603 and/or memory 605 can perform actions or operations defined by the communication prioritizing component 610 for determining whether to prioritize a first communication or a second communication, the first communication and the second communication related to a first resource and a second resource, respectively, based on different TTIs, and received on a common resource. In an aspect, for example, the communication prioritization component 610 may include hardware (e.g., one or more processor modules of the one or more processors 603), and/or computer readable code or instructions stored in the memory 605 and executable by at least one of the one or more processors 603 to perform the particularly configured communication prioritization operations described herein. Further, for example, the one or more processors 603 and/or memory 605 can perform actions or operations defined by the optional common resource determining component 612 for determining a common resource over which the first communication and the second communication overlap. In an aspect, for example, the common resource determining component 612 may include hardware (e.g., one or more processor modules of the one or more processors 603), and/or computer readable code or instructions stored in the memory 605 and executable by at least one of the one or more processors 603 to perform the specifically configured resource determining operations described herein. Further, for example, the one or more processors 603 and/or memory 605 can optionally perform actions or operations defined by the optional prioritization information receiving component 614 for obtaining information regarding prioritizing the first or second communication on the common resource. In an aspect, for example, the prioritization information receiving component 614 may include hardware (e.g., one or more processor modules of the one or more processors 603), and/or computer readable code or instructions stored in the memory 605 and executable by at least one of the one or more processors 603 to perform the particularly configured information receiving operations described herein.

Similarly, in an aspect, eNB604 can include one or more processors 653 and/or memory 655, which can be communicatively coupled, e.g., via one or more buses 657, and can operate in conjunction with scheduling component 302 or otherwise implement scheduling component 302 for generating resource grants for UE602 and/or other UEs from the resources. For example, various functions related to scheduling component 302 can be implemented or otherwise performed by one or more processors 653, and in an aspect, the functions can be performed by a single processor, while in other aspects, different ones of the functions can be performed by a combination of two or more different processors, as described above. It is to be appreciated that in one example, the one or more processors 653 and/or memory 655 can be configured as described above with respect to the example of the one or more processors 603 and/or memory 605 of the UE 602.

In an example, one or more processors 653 and/or memory 655 can perform actions or operations defined by the schedule component 302 or subcomponents thereof. For example, the one or more processors 653 and/or memory 655 can perform the actions or operations defined by the legacy resource allocation component 620 for allocating a first set of resources to one or more UEs (e.g., resources over legacy communication technologies that operate based on the first TTI). In an aspect, for example, the legacy resource allocation component 620 can comprise hardware (e.g., one or more processor modules of the one or more processors 653) and/or computer readable code or instructions stored in the memory 655 and executable by at least one of the one or more processors 653 to perform specifically configured legacy resource allocation operations described herein. Further, for example, one or more processors 653 and/or memory 655 can perform actions or operations defined by ULL resource allocation component 622 for allocating a second set of resources to one or more UEs (e.g., resources on ULL communications technologies that operate based on a second TTI shorter than the first TTI). In an aspect, for example, ULL resource allocation component 622 may include hardware (e.g., one or more processor modules of one or more processors 653) and/or computer readable code or instructions stored in memory 655 and executable by at least one of the one or more processors 653 to perform the specifically configured ULL resource allocation operations described herein. Further, for example, the one or more processors 653 and/or memory 655 can perform actions or operations defined by the optional communication prioritization indication component 624 for indicating information to one or more UEs regarding prioritizing communications on resources that overlap in the first and second resource allocations. In an aspect, for example, the communication prioritization indication component 624 may include hardware (e.g., one or more processor modules of the one or more processors 653) and/or computer readable code or instructions stored in the memory 655 and executable by at least one of the one or more processors 653 to perform particular prioritization indication operations described herein.

It is to be appreciated that the transceiver 606,656 may be configured to send and receive wireless signals through one or more antennas, an RF front end, one or more transmitters, and one or more receivers. In an aspect, the transceiver 606,656 may be tuned to operate at a specified frequency such that the UE602 and/or eNB604 may communicate at a certain frequency. In an aspect, the one or more processors 603 may configure the transceiver 606 and/or the one or more processors 653 may configure the transceiver 656 to operate at specified frequencies and power levels based on configuration, communication protocol, etc., to transmit uplink signals 608 and/or downlink signals 609, respectively, on an associated uplink communication channel or downlink communication channel.

in an aspect, the transceiver 606,656 may operate in multiple frequency bands (e.g., using a multi-band multi-mode modem, not shown) to process digital data transmitted and received using the transceiver 606,656. In an aspect, the transceivers 606,656 may be multi-band and may be configured to support multiple frequency bands of a particular communication protocol. In an aspect, the transceiver 606,656 may be configured to support multiple operating networks and communication protocols. Thus, for example, the transceiver 606,656 may enable sending and/or receiving signals based on a specified modem configuration.

Fig. 7 illustrates a methodology 700 for prioritizing communications (e.g., by a UE) over a set of resources common to a first communication (e.g., a legacy communication) based on a first TTI and a second communication (e.g., a ULL communication) based on a shorter second TTI. At block 702, the UE may receive a first communication over a first set of resources based on a first TTI. In an aspect, communicating component 361 (fig. 6) can receive (e.g., via transceiver 606) the first communication over the first set of resources based on the first TTI. In one example, the first communication can correspond to broadcast data transmitted by the eNB604, such as control data or traffic data related to system information transmissions, paging transmissions, random access transmissions, and so forth. In another example, the first communication may correspond to unicast data, such as control or traffic data, reference signals, etc., that may or may not be related to the UE 602. In a particular example, the first communication may correspond to a PDSCH/EPDCCH of a legacy communication technology (e.g., LTE), one or more DM-RS symbols, and/or the like. It is to be appreciated that the eNB604 can allocate first resources and/or second resources to the UE602 for receiving communications from the eNB604 as further described herein.

at block 704, the UE may receive a second communication over a second set of resources based on a second TTI, wherein the second TTI is less than the first TTI, and wherein the second set of resources overlaps the first set of resources to define a set of common resources. In an aspect, communicating component 361 can similarly receive (e.g., via transceiver 606) the second communication over the second set of resources based on the second TTI, wherein the second TTI is smaller than the first TTI, and wherein the second set of resources overlaps the first set of resources to define a common set of resources. In one example, the second communication can correspond to control data or traffic data of a ULL communication technology (e.g., ULL LTE) having a smaller TTI than a legacy communication technology of the first communication. In one example, the duration of the first TTI may be a subframe (e.g., where the first communication involves LTE), and the duration of the second TTI may be one symbol, two symbols, one slot, etc. As described, the first set of resources and the second set of resources may overlap as shown in fig. 5, for example, where the first set of resources may correspond to resources in legacy downlink transmission resources 502 and the second set of resources may correspond to resources in one or more of ULL transmission resources 512 or 514.

Accordingly, at block 706, the UE may determine whether to prioritize decoding of the first communication over the second communication. In an aspect, communications prioritization component 610 may determine whether to prioritize decoding of the first communication over the second communication. This can include a common resource determining component 612 for determining a set of common resources between the first communication and the second communication, and a communication prioritizing component 610 for determining certain aspects of the common resources. For example, common resource determining component 612 may determine the common set of resources based at least in part on receiving allocation information for the first set of resources and/or the second set of resources from eNB604 and determining resources that overlap between the first set of resources and the second set of resources. In an example, UE602 can be configured with a second set of resources for receiving the second communication in ULL communication technology and can receive a communication in control data related to legacy communication technology to determine the first set of resources for the first communication. For example, common resource determining component 612 can receive a Physical Downlink Control Channel (PDCCH) from eNB604 related to the first set of resources, which can specify usage of the first set of resources (e.g., for broadcast data, unicast data, such as PDSCH/PDCCH, etc.). Communication prioritization component 610 can accordingly determine to prioritize communications based at least in part upon common resource determination component 612 detecting the set of common resources.

Additionally, in an example, communication prioritization component 610 can prioritize the first communication or the second communication based on one or more aspects of the common set of resources. For example, at block 708, the UE may optionally determine whether the first one of the common resource sets corresponds to broadcast data, includes DM-RS resources, includes EPDCCH, or includes data corresponding to a particular MCS, resource allocation size, or number of layers. In an example, the common resource determining component 612 can determine whether at least the first one of the common resource sets corresponds to broadcast data, includes DM-RS resources, includes EPDCCH, or includes data corresponding to a particular MCS, resource allocation size, or number of layers. For example, communication prioritization component 610 may be configured to determine whether to prioritize the first communication or the second communication based on the determination of common resource determination component 612. In an example, the determination can be further based on a configuration or other information received from the eNB604 or another network node, a configuration stored in a memory of the UE602, or the like, that specifies when to prioritize the first or second communication based on relevant content of the first one of the common sets of resources. In a particular example, the communication prioritization component 610 can prioritize receipt of the first communication upon decoding communications received on the common resource, wherein the first set of resources in the common set of resources is at least one of corresponding to broadcast data, including DM-RS resources, including EPDCCH, or including data corresponding to a particular MCS, resource allocation size, or number of layers. Otherwise, similarly, communications prioritization component 610 can prioritize receipt of the second communication upon decoding a communication received on the common set of resources.

for example, communications prioritization component 610 may determine whether the first one of the common sets of resources corresponds to broadcast data. For example, UE602 can be aware of both a legacy broadcast channel (e.g., based on decoding of a PDCCH from eNB 604) and a ULL channel (e.g., based on receiving an allocation of the second set of resources corresponding to the ULL channel). In one example, communicating component 361 can decode a PDCCH corresponding to a Radio Network Temporary Identifier (RNTI) (e.g., System Information (SI) -RNTI, paging (P) -RNTI, Random Access (RA) -RNTI, etc.) of UE602 to determine whether broadcast data is present in the first set of resources. If so, common resource determining component 612 can determine whether the first set of resources overlaps the second communication (e.g., ULL data) on the second set of resources, wherein the overlapping resources define a common set of resources. In the event that there is overlap, communication prioritizing component 610 can determine to prioritize receiving the broadcast data over receiving the second communication in at least the common set of resources. In this example, communication prioritizing component 610 can determine to receive the second communication in non-overlapping remaining resources of the second set of resources. In either case, in this regard, the priority broadcast data may ensure that the UE602 receives the broadcast data from the eNB604, which may be more important than ULL data.

In another example, communications prioritization component 610 can determine whether the first set of resources in the common set of resources corresponds to DM-RS resources for DM-RS transmissions or otherwise includes one or more DM-RS transmissions in a legacy communications technology. This may include: communication component 361 determines the first set of resources as relating to or including a DM-RS region of resources reserved for transmitting DM-RS in conventional communication techniques (e.g., DM-RS region 506 in fig. 5), which may be based in part on decoding the DM-RS over the resource region, as compared to a DM-RS region reserved for transmitting DM-RS in conventional communication techniques, prioritisation information receiving component 614 receives from eNB604 an indication of actual resource elements within the DM-RS region for DM-RS transmissions (e.g., in a DM-RS configuration received from eNB604 or another network entity), which may include a DM-RS configuration for rate matching around DM-RS when decoding conventional communications, and/or the like. In the case where DM-RS resources overlap ULL data resources, if one slot of the DM-RS is punctured, a legacy channel may be decoded based on the DM-RS for a rank of 4 or less. However, if both slots of the DM-RS are punctured, it may not be possible to decode the legacy channel because the DM-RS cannot be efficiently processed.

In any case, the UE602 can learn resources (referred to as DM-RS related resources) reserved for or used for DM-RS transmission in legacy communication technologies (e.g., on the first set of resources) and ULL channels (e.g., based on receiving an assignment for the second set of resources corresponding to the ULL channels). Common resource determining component 612 can accordingly determine whether the DM-RS related resource overlaps the second communication (e.g., ULL data) over the second set of resources, wherein the overlapping resources can define a common set of resources. An example of the overlapping ULL resources is shown in fig. 5 as ULL transmission resources 514 overlapping DM-RS region 506. In the event that there is an overlap in common resource sets, the communication prioritization component 610 can determine to prioritize receiving the first communication (e.g., on the DM-RS related resources) over receiving the second communication in at least the common resource sets. In this example, communications prioritization component 610 can determine to receive the second communication in remaining resources of the second set of resources.

In a more specific example, communications prioritization component 610 can determine to prioritize receipt of the first communication over the set of common resources and/or receipt of the first communication over a particular resource within the set of common resources over which a DM-RS is transmitted. For example, communications prioritization component 610 can determine to prioritize receipt of the first communication over the set of common resources corresponding to DM-RS symbols in legacy communications technologies, corresponding to particular resource elements over which the DM-RS symbols are transmitted, and/or the like. In one example, prioritization information receiving component 614 may receive an indication of which resource elements in which symbols include DM-RS transmissions (e.g., in a DM-RS configuration from eNB 604). Thus, the communications prioritization component 610 can determine to prioritize receipt of the second communication over the second set of resources other than the common set of resources and/or over resource elements within the common set of resources other than the symbol or a particular resource element within the symbol over which the DM-RS is transmitted. In yet another example, communications prioritization component 610 may determine to preferentially receive the first communication over a fraction or a single particular resource element within the common resource set of a particular resource element over which the DM-RS is transmitted, and communications prioritization component 610 may accordingly determine to receive the second communication in remaining resource elements within the common resource set.

In another example, where the first set of resources is not related to broadcast data and does not include DM-RS (e.g., resources in the non-DM-RS region 504), the communication prioritization component 610 can determine that the first set of resources in the common set of resources includes EPDCCH or data corresponding to a particular MCS, resource allocation size, or number of layers, which can be given higher priority in some examples. This may include: communicating component 361 decodes a PDCCH from eNB604 corresponding to the first set of resources to determine whether the first set of resources includes an EPDCCH, a particular MCS, a particular resource allocation size, or a particular number of layers. For example, data having a higher MCS (e.g., implementing a threshold MCS or an MCS corresponding to one or more specified MCSs), resource allocation size (e.g., implementing a threshold allocation size or a resource allocation size corresponding to one or more specified allocation sizes), or number of layers (e.g., implementing a threshold number of layers or a number of layers corresponding to one or more specified number of layers) may indicate data that is sensitive to resource availability. As an example, if some of the allocated resources are reallocated and thus become unavailable, the combination of MCS and resource allocation size resulting in a high coding size (e.g., >0.5) may be sensitive to resource availability. As another example, data transmission with two or more layers may also be more sensitive to over-occupied (overrake) resources. Thus, in these cases, for example, the communication prioritization component 610 can determine to prioritize the data to help ensure receipt of the data. The common resource determining component 612 can accordingly determine whether the first resource including EPDCCH or related to a particular MCS, resource allocation size, or number of layers overlaps with a second communication (e.g., ULL data) on the second set of resources, which can define a common set of resources. In the event that there is overlap in common resource sets, the communication prioritizing component 610 can determine to preferentially receive the first communication (e.g., EPDCCH or data with a particular MCS, resource allocation size, number of layers, etc.) over the second communication at least in the common resource sets. In this example, communications prioritization component 610 can determine to receive the second communication in remaining resources of the second set of resources.

In the above example, it is described that the common resource determining component 612 determines whether a common resource set exists after being determined that the first resource set relates to a particular transmission. However, it is to be appreciated that common resource determining component 612 can determine the common resources prior to determining whether the first set of resources relates to a particular transmission. In this example, where common resource determining component 612 does not detect resources that overlap the second set of resources, no determination need be made as to the occurrence of transmissions on the first set of resources.

Further, it is to be appreciated that the communication prioritization indicating component 624 can configure functionality of the communication prioritization component 610 described above, the prioritization information receiving component 614 can receive the functionality described above, and the communication prioritization component 610 can utilize the functionality described above in providing for prioritizing communications over resources granted to the UE 602. In this regard, scheduling component 302 can transmit the first communication over the first set of resources and the second communication over the second set of resources while selecting either the first or second communication to transmit over the common set of resources to facilitate the UE602 receiving the appropriate communication in accordance with the above-described configuration.

In another example, the UE602 may treat the overlapping first and second resource sets as an error event. In other words, the UE602 may not be expected to receive the first communication and the second communication using a common set of resources. In this case, if common resource determining component 612 detects overlapping transmissions for the first communication and the second communication, communicating component 361 may discard at least one of the two communications. The discarding may depend on some rules similar to those discussed above, which may be configured in the UE602 (e.g., by the eNB604 or another network entity) or otherwise stored in a related configuration at the UE602, and so on.

Further, for instance, communicating component 361 can receive the first communication and the second communication concurrently on the set of common resources and can perform interference cancellation when decoding respective communications. Further, in an example, communicating component 361 can receive the first communication and the second communication simultaneously over a first set of resources and a second set of resources that are not in a common set of resources. Thus, for example, in the event that common resource determining component 612 does not determine common resources between the first and second communications, communicating component 361 can receive and decode the first and second communications without prioritization by communication prioritizing component 610.

In an optional aspect, the UE may decode at least a portion of the first communication or the second communication based on the determined prioritization at block 710. In an example, communicating component 361 can facilitate the decoding.

In another example, the first set of resources or the second set of resources may correspond to different UEs, so one UE may not know that the resources overlap with resources allocated to another UE. Fig. 8 illustrates a methodology 800 for managing (e.g., by an eNB) resource allocations to avoid overlap and/or provide information to a UE related to prioritizing the communications. At block 802, the eNB may allocate a first set of resources for transmitting a first communication according to a first TTI, and at block 804, the eNB may allocate a second set of resources for transmitting a second communication according to a second TTI, wherein the second TTI is less than the first TTI. In an aspect, legacy resource allocating component 620 (fig. 6) may allocate the first set of resources for transmitting the first communication according to the first TTI, and ULL resource allocating component 622 may allocate the second set of resources for transmitting the second communication according to the second TTI. As described above, the duration of the first TTI may be a subframe (e.g., where the first communication involves LTE), and the duration of the second TTI may be one symbol, two symbols, one slot, etc. Further, the first set of resources and the second set of resources may correspond to the same or different UEs. In any case, ULL resource allocation component 622 may attempt to avoid overlapping with the first set of resources when allocating the second set of resources, and/or vice versa.

However, for example, in some cases, it may not occur or may not be possible to avoid overlap altogether. In an example, ULL resource allocation component 622 may attempt to allocate the second set of resources in the common set of resources that overlap the first set of resources by determining the first set of resources as being associated with one or more channels that are less sensitive to puncturing. For example, ULL resource allocation component 622 may determine a second set of resources related to a channel in a legacy wireless technology and having a particular MCS, resource allocation size, number of layers, etc., such as the MCS, resource allocation size, number of layers, etc., being below a threshold for allocation to UE602 to facilitate ULL communications. In another example, ULL resource allocation component 622 may attempt to allocate the second set of resources in common resources that overlap the first set of resources in a non-DM-RS region so as to avoid interfering with DM-RS transmissions (or at least avoid overlapping all symbols of the DM-RS).

In these or other examples, the eNB may optionally indicate one or more parameters to the UE regarding prioritizing communications received over at least a portion of the first set of resources or the second set of resources at block 806. In an aspect, communication prioritization indicating component 624 may indicate to UE602 one or more parameters regarding prioritizing communications received on at least a portion of overlapping first or second sets of resources. A prioritization information receiving component 614 may receive the indication, and a communication prioritization component 610 may prioritize communications on the first or second resources based at least in part on the indication accordingly. For example, the indication may indicate resource unavailability in the second set of resources related to the first set of resources (e.g., for a uPDCCH allocation) (e.g., puncturing of at least a portion of the second set of resources for communication over the second set of resources — which may be related to another UE), and thus communication prioritization component 610 may determine, based on the indication, not to receive the second communication in at least a portion of resources in the second set of resources that may overlap with the first set of resources, as described. For example, the indication may include one or more upcch bits that may be processed by the ULL UEs. In another example, the first set of resources may include one or more REs on which DM-RS is transmitted (e.g., for different UEs). In this example, the indication may specify a DM-RS symbol, a DM-RS resource element, or otherwise relate to whether rate matching is performed for the second communication around DM-RS REs in the allocated resource block (e.g., where DM-RS REs may overlap with legacy transmissions in the first set of resources). In this example, based on the indication, communication prioritization component 610 can accordingly determine whether to rate match around the associated DM-RS RE when decoding the second communication.

At block 808, the eNB may transmit a first resource grant corresponding to the first set of resources on a downlink control channel, and may transmit a second resource grant corresponding to the second set of resources on the downlink control channel at block 810. In an aspect, scheduling component 302 may send a first resource grant (e.g., resource grant 680) corresponding to the first set of resources on the downlink control channel (e.g., to one or more UEs) and may send a second resource grant (e.g., resource grant 680) corresponding to the second set of resources on the downlink control channel (e.g., to one or more UEs or one or more different UEs). In an example, ULL resource allocation component 622 may allocate the second set of resources (e.g., at block 804) while scheduling component 302 is transmitting first communications over the allocated first set of resources. This situation may not allow planning of the allocation of ULL resources, which may result in the overlapping resources described in fig. 5.

It is to be understood that the specific order or hierarchy of steps in the processes disclosed is an illustration of exemplary scenarios. It is understood that the specific order or hierarchy of steps in the processes may be rearranged based on design preferences. Furthermore, some steps may be combined or omitted. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more. The term "some" means one or more unless specifically stated otherwise. All structural and functional equivalents to the elements of the various aspects described herein that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. Accordingly, no claim element is to be construed as a unit plus function unless the element is explicitly recited using the phrase "unit for …".

Claims (12)

1. A method of wireless communication, comprising:

Allocating a first set of resources for transmitting a first communication according to a first Transmission Time Interval (TTI);

Allocating a second set of resources for transmitting a second communication according to a second TTI, wherein the second TTI is less than the first TTI;

Transmitting a first resource grant corresponding to the first set of resources on a downlink control channel; and

Transmitting a second resource grant corresponding to the second set of resources on the downlink control channel.

2. The method of claim 1, further comprising: indicating resource unavailability related to at least part of the first set of resources to a user equipment.

3. The method of claim 1, wherein allocating the second set of resources comprises:

Allocate the second set of resources for partial overlap with the first set of resources based at least in part on at least one of a modulation and coding scheme, a resource allocation size, or a number of layers of one or more channels corresponding to the first set of resources.

4. The method of claim 1, further comprising:

indicating to a user equipment whether to rate match around one or more demodulation reference signal resource elements in the first set of resources based at least in part on determining that the second set of resources overlaps with the first set of resources.

5. The method of claim 1, wherein allocating the second set of resources comprises:

Allocating the second set of resources for avoiding overlapping with the first set of resources in a portion of the first set of resources corresponding to one or more demodulation reference signals.

6. The method of claim 1, further comprising:

Transmitting the first communication in accordance with the first resource grant, wherein the second set of resources are allocated during transmission of the first communication.

7. An evolved node b (enb) for wireless communication, comprising:

A transceiver;

At least one processor communicatively coupled with the transceiver via a bus to transmit signals in a wireless network; and

A memory communicatively coupled with the at least one processor and/or the transceiver via the bus;

Wherein the at least one processor and the memory are operable to:

Allocating a first set of resources for transmitting a first communication according to a first Transmission Time Interval (TTI);

allocating a second set of resources for transmitting a second communication according to a second TTI, wherein the second TTI is less than the first TTI;

transmitting, via the transceiver, a first resource grant corresponding to the first set of resources on a downlink control channel; and

Transmitting, via the transceiver, a second resource grant corresponding to the second set of resources on the downlink control channel.

8. The eNB of claim 7, wherein the at least one processor and the memory are further operable to:

indicating resource unavailability related to at least part of the first set of resources to a user equipment.

9. The eNB of claim 7, wherein the at least one processor and the memory are operable to:

Allocate the second set of resources for partial overlap with the first set of resources based at least in part on at least one of a modulation and coding scheme, a resource allocation size, or a number of layers of one or more channels corresponding to the first set of resources.

10. The eNB of claim 7, wherein the at least one processor and the memory are further operable to:

Indicating to a user equipment whether to rate match around one or more demodulation reference signal resource elements in the first set of resources based at least in part on determining that the second set of resources overlaps with the first set of resources.

11. The eNB of claim 7, wherein the at least one processor and the memory are operable to:

Allocating the second set of resources for avoiding overlapping with the first set of resources in a portion of the first set of resources corresponding to one or more demodulation reference signals.

12. the eNB of claim 7, wherein the at least one processor and the memory are further operable to:

Transmitting, via the transceiver, the first communication in accordance with the first resource grant, wherein the second set of resources are allocated during transmission of the first communication.